<div class="page-title">
	<h1>BTU Calculator</h1>
</div>
<div id="btu-calc">
	<form name="frm1">
		<table border="0" cellpadding="0" cellspacing="0" class="btu-table1">
			<tr><td colspan="3" class="btu-or"><label>Please select your room and window type directly below followed by how sheltered your house is from the outside elements. Then proceed to the next row of boxes...</label></td></tr>
        	<tr><td colspan="3" class="btu-splitter1"></td></tr>
			<tr class="labels">
				<td class="btu-maincell1 btu-row1"><label>Room Type</label></td>
				<td class="btu-maincell1 btu-row1"><label>Window Type</label></td>
				<td class="btu-maincell1-end btu-row1"><label>Is the house</label></td>
			</tr>
			<tr class="dropdowns">
				<td>
					<select name="iRoomType" id="iRoomType" class="btu-select">
						<option value="">Please Select</option>
						<option value="1.00">Bathroom</option>
						<option value="0.80">Bedroom</option>
						<option value="1.00">Dining Room</option>
						<option value="0.80">Hallway</option>
						<option value="0.80">Kitchen</option>
						<option value="1.00">Living Room</option>
						<option value="1.33">Conservatory</option>
			  		</select>
				</td>
				<td>
					<select name="iWindowType" id="iWindowType" class="btu-select">
						<option value="">Please Select</option>
						<option value="1.10">Single Glazed</option>
						<option value="1.00">Double Glazed</option>
			  		</select>
				</td>
				<td colspan="3">
					<select name="iLocationType" id="iLocationType" class="btu-select">
						<option value="">Please Select</option>
						<option value="0.85">Sheltered</option>
						<option value="1.00">Average</option>
						<option value="1.20">Exposed</option>
			  		</select>
				</td>
			</tr>
            <tr><td colspan="3" class="btu-splitter1"></td></tr>
			<tr class="labels">
				<td class="btu-maincell1 btu-row2"><label>Length (m)</label></td>
				<td class="btu-maincell1 btu-row2"><label>Width (m)</label></td>
				<td class="btu-maincell1-end btu-row2"><label>Height (m)</label></td>
			</tr>
			<tr>
				<td><input class="input-text btu-text1" type="text" name="lengthm" id="lengthm" value="" maxlength="10" onkeypress="return checkValidNumber(event);" onblur="return f5()"/></td>
				<td><input class="input-text btu-text1" type="text" name="widthm" id="widthm" value="" maxlength="10" onkeypress="return checkValidNumber(event);" onblur="return f4()"/></td>
				<td><input class="input-text btu-text1" type="text" name="heightm" id="heightm" value="" maxlength="10" onkeypress="return checkValidNumber(event);" onblur="return f6()"/></td>
			</tr>
			<tr>
				<td colspan="3" class="btu-or"><label>Now enter your room measurements in metres just above OR in feet just below, then click calculate for your heat output requirements...</label></td>
			</tr>
			<tr class="labels">
				<td class="btu-maincell1 btu-row3"><label>Length (ft)</label></td>
				<td class="btu-maincell1 btu-row3"><label>Width (ft)</label></td>
				<td class="btu-maincell1-end btu-row3"><label>Height (ft)</label></td>
			</tr>
			<tr>
				<td><input class="input-text btu-text2" type="text" name="lengthf" id="lengthf" value="" maxlength="10" onkeypress="return checkValidNumber(event);" onblur="return f2()"/></td>
				<td><input class="input-text btu-text2" type="text" name="widthf" id="widthf" value="" maxlength="10" onkeypress="return checkValidNumber(event);" onblur="return f1()"/></td>
				<td><input class="input-text btu-text2" type="text" name="heightf" id="heightf" value="" maxlength="10" onkeypress="return checkValidNumber(event);" onblur="return f3()"/></td>
			</tr>
			<tr class="button-row">
            	<td></td>
                <td></td>
				<td>
					<!-- <input type="submit" name="iSubmit"  value="CALCULATE" onclick="return calculate();" /> -->
					<button type="submit" class="form-button btu-calculate" name="iSubmit" onclick="return calculate();"><span><span><span>Calculate</span></span></span></button>
				</td>
			</tr>
		</table>
		<table border="0" cellpadding="0" cellspacing="0">
        	<tr><td colspan="5" class="btu-splitter2"></td></tr>
			<tr>
				<td class="btu-maincell2 btu-row4"><label>BTU / hr</label></td>
				<td class="btu-fromto"><label>From</label></td>
				<td><input class="input-text btu-text3" type="text" name="iBtuFrom" id="iBtuFrom" value="" readonly="readonly" /></td>
				<td class="btu-fromto"><label>To</label></td>
				<td><input class="input-text btu-text3" type="text" name="iBtuTo" id="iBtuTo" value="" readonly="readonly" /></td>
			</tr>
			<tr>
				<td class="btu-maincell2-end btu-row4"><label>Watts</label></td>
				<td class="btu-fromto"><label>From</label></td>
				<td><input class="input-text btu-text3" type="text" name="iWattsFrom" id="iWattsFrom" value="" readonly="readonly" /></td>
				<td class="btu-fromto"><label>To</label></td>
				<td><input class="input-text btu-text3" type="text" name="iWattsTo" id="iWattsTo" value="" readonly="readonly" /></td>
			</tr>
		</table>
	</form>
</div>
<div id="btu-rightcolumn">
	<!--<p>Choose and enter in the appropriate values in the form on the right. Then click "<b>CALCULATE REQUIREMENTS</b>" to get your room's BTU requirements.</p>
    <p>Please note, this is a guide only. Radiators and heated towel rails with insufficient output may never raise the temperature to that required. Outdoor temperatures, external walls, insulation, heated adjacent rooms (i.e. above, below and to the side) all play a part.</p>
    <p>The boiler should be sufficient to supply all connected radiators to the sum of their maximum demand. Larger rooms such as Living Rooms may require more than one radiator positioned evenly throughout the room. If this is the case, divide the required output between the number of radiators needed.</p>
    <p></p>
    <p><i>"The <b>British thermal unit</b> (symbol <b>BTU</b> or <b>Btu</b>) is a traditional unit of <a>energy</a> equal to about 1,055 <a>joules</a>. It is approximately the amount of energy needed to heat 1 pound (0.454 kg) of water (therefore around 0.1198 gallons) from 39 to 40&deg; F (3.8 to 4.4&deg; C).<a><sup>[1]</sup></a> The unit is most often used in the <a>power</a>, <a>steam</a> generation, <a>heating</a> and <a>air conditioning</a> industries.</i></p>
    <p><i>In scientific contexts the BTU has largely been replaced by the <a>SI</a> unit of energy, the <a>joule</a>, though it may be used as a measure of agricultural energy production (BTU/kg).</i></p>
    <p><i>It is still used unofficially in <a>metric</a> English-speaking countries (such as <a>Canada</a>), and remains the standard unit of classification for air conditioning units manufactured and sold in many non-English-speaking metric countries."</i></p>
    <p><b>Excerpt taken from <a>Wikipedia</a>&reg;, text reproduced under the Creative Commons Attribution-ShareAlike License.</b></p>-->
</div>
<div class="clear"></div>